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Authors
Dong, Yongqiang
Wan, Lisi
Cai, Jianhua
Fang, Qingqing
Chi, Yuwu
Chen, Guonan
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Article History
Received: 28 November 2014
Accepted: 26 March 2015
First Online: 6 May 2015
Competing interests
: The authors declare no competing financial interests.
